Turkish President Recep Tayyip Erdoğan and NATO Secretary General Jens Stoltenberg discussed in a phone conversation the US plans to create the so-called border security force in Syria, a source in the Turkish leader's administration said on Tuesday.

The source told reporters that Erdoğan underlined the unacceptability of creating new military units in Syria and noted that Ankara would take the necessary measures to prevent it.

Stoltenberg, in his turn, noted that Washington did not consult with NATO concerning the creation of a new border force in Syria, according to the source.

On Saturday, the Defense Post news website published an article in which the spokesman of the US-led coalition, said that the coalition was engaged in training a force on the territory within Syria currently controlled by Syrian Democratic Forces (SDF) to maintain security in a controlled area along the Syrian border.

Erdoğan threatened to eliminate the new troops on Monday, noting that the United States was forming a terrorist army under the disguise of so-called Border Security Force (BSF) on the Syrian territory controlled by the Kurdish-led Syrian Democratic Forces (SDF) militia.